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From: "Leon Heller"
Newsgroups: sci.electronics.design
Subject: Re: Radio Direction Finding
Date: Tue, 5 Nov 2002 12:44:09 -0000
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"Keith Wootten" wrote in message
news:sMvRyVaLz6x9EwAZ@ntlworld.com...
> Wireless Wizards,
>
> Is there any way of making a unidirectional or cardioid antenna which
> uses only the magnetic component of the EM wave? I know about
> synthesising a cardioid pattern using a loop and a whip, but I don't
> want the whip. It has to be much smaller than the wavelength, but
> efficiency isn't much of an issue.
>
A shielded loop antenna (you can make one from co-ax cable) only picks up
the H field. I think the ARRL Antenna Handbook has some info on them. They
are directional, like all loop antennas.
Leon
--
Leon Heller, G1HSM
leon_heller@hotmail.com
http://www.geocities.com/leon_heller